DTC 61-01

DTC 61-01: Modulator-control Unit Initial IG Low Voltage
DTC 61-21: Modulator-control Unit Power Source Low Voltage 1
DTC 61-22: Modulator-control Unit Power Source Low Voltage 2
DTC 61-23: Modulator-control Unit Power Source Low Voltage 3
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF, then start the engine.
4. Check for DTCs with the HDS.
Is DTC 61-01, 61-21, 61-22, or 61-23 indicated?
YES - Go to step 5.
NO - intermittent failure, the system is OK at this time. Check for loose terminals at the ABS modulator-control unit 25P connector. Refer to intermittent failures troubleshooting. Intermittent Failures
5. Check and note BATTERY voltage in the ABS DATA LIST with the HDS. If the voltage listed is 0 V, go to step 8, otherwise go to step 6.
6. Using a voltmeter, measure and note the voltage between the battery terminals.

NOTE: If the voltage is below 9.5 V, check the battery, and do the alternator regulator circuit troubleshooting.

7. Compare the voltage noted in step 5 to the voltage step 6.
Is the difference between the two voltage readings less then 3 V?
YES - Intermittent failure, the system is OK at this time. Check for loose terminals at the ABS modulator-control unit 25P connector. Refer to intermittent failures troubleshooting. Intermittent Failures
NO - Check for loose terminals in the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit, and retest.
8. Turn the ignition switch OFF.
9. Disconnect the ABS modulator-control unit 25P connector.





10. Measure voltage between ABS modulator-control unit 25P connector terminal No. 8 and body ground.
Is there battery voltage?
YES - Go to step 11.
NO - Repair open in the wire between the No. 3 FSR (30 A) fuse and the ABS modulator-control unit.
11. Turn the ignition switch ON (II).





12. Measure voltage between ABS modulator-control unit 25P connector terminal No. 16 and body ground.
Is there battery voltage?
YES - Check for loose terminals in the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit and retest.
NO - Repair open in the wire between the No. 4 (7.5 A) fuse and the ABS modulator-control unit.